Update README.md

Author: dennisvandehoef

README.md

@@ -1,6 +1,8 @@
 # EasyGravatar
 
-TODO: Write a gem description
+Gravatar.com, mainly known for its avatar hosting. But users can store more than only an avatar at gravatar.
+
+This gem also allows you to easily access it all (accounts at other social networks, more photo's, the name of the user, saved websites, cryptocurrency accounts and more)
 
 ## Installation
 
@@ -20,7 +22,29 @@ Or install it yourself as:
 
 ## Usage
 
-TODO: Write usage instructions here
+Creating an instance is easy:
+```ruby
+user = EasyGravatar::Gravatar.new("foo@bar.com")
+```
+
+Or use the even shorter class Gravatar:
+```ruby
+user = Gravatar.new("foo@bar.com")
+```
+
+After creating an instance you can get some basics fast using
+```ruby
+user.full_name # => the full name of the user
+user.avatar # => the avatar from the user, in the default gravatar width of 80 pixels
+user.avatar(150) # => the avatar from the user, in with a width of 150 pixels
+```
+Feel free to contribute to the project and add your own "short getters".
+
+All the available information is saved in a hash. Use `user.hash` to get the hash. As an alternative it is also possible to easily read from the hash.
+```ruby
+user.get_value(:formattedName) # => also gives the full name
+user.get_value(:currency, :bitcoin) # => gives the users bitcoin address
+```
 
 ## Contributing